This layer contains the DSM for LiDAR data in the Canterbury Region surronding Christchurch and the Ashley River between 2018 and 2019.

- The DEM is available as layer [Canterbury - Christchurch and Ashley River 1m DEM (2018)](https://data.linz.govt.nz/layer/104497).

- The index tiles are available as layer [Canterbury - Christchurch and Ashley River LiDAR Index Tiles (2018)](https://data.linz.govt.nz/layer/104499).

- The LAS point cloud and vendor project reports are available from [OpenTopography](http://opentopo.sdsc.edu/datasets).

LiDAR was captured for Environment Canterbury Regional Council by Aerial Surveys from 20 July 2018 to 01 March 2019. These datasets were generated by Aerial Surveys and their subcontractors. Data management and distribution is by Land Information New Zealand.

Released by LINZ under Creative Commons Attribution 4.0 New Zealand (CC BY 4.0) with:

Following Attribution:"Sourced from the LINZ Data Service and licensed by Environment Canterbury Regional Council, for re-use under CC BY 4.0."For details see: https://www.linz.govt.nz/data/licensing-and-using-data/attributing-elevation-or-aerial-imagery-data

The LiDAR sensor positioning and orientation (POS) was determined using the collected GPS/IMU datasets and Applanix POSPac software.

Please refer to survey reports for benchmark and base station information.

The POS data was combined with the LiDAR range files and used to generate LIDAR point clouds in NZTM and ellipsoidal heights. This process was undertaken using Optech LMS LiDAR processing software. The data was checked for completeness of coverage. The relative fit of data in the overlap between strips was also checked.

The positional accuracy of the LiDAR data has been checked by overlaying Sounds Surveying Ltd surveyed data over the LiDAR data displayed coded by intensity. The data was found to fit well in position.

The point cloud data was then classified withTerraSolid LiDAR processing software into ground and above ground returns using automated routines tailored to the project landcover and terrain.